﻿// bsn ModuleStore database versioning
// -----------------------------------
// 
// Copyright 2010 by Arsène von Wyss - avw@gmx.ch
// 
// Development has been supported by Sirius Technologies AG, Basel
// 
// Source:
// 
// https://bsn-modulestore.googlecode.com/hg/
// 
// License:
// 
// The library is distributed under the GNU Lesser General Public License:
// http://www.gnu.org/licenses/lgpl.html
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;

using bsn.GoldParser.Semantic;

namespace bsn.ModuleStore.Sql.Script {
	public sealed class LeftOuterJoin: PredicateJoin {
		[Rule("<Join> ::= ~LEFT <JoinHint> ~JOIN <Source> ~ON <Predicate>")]
		[Rule("<Join> ::= ~LEFT ~OUTER <JoinHint> ~JOIN <Source> ~ON <Predicate>")]
		public LeftOuterJoin(Optional<KeywordToken> hint, Source joinSource, Predicate predicate): base(hint, joinSource, predicate) {}

		public override JoinKind Kind {
			get {
				return JoinKind.Left;
			}
		}

		protected override string JoinSpecifier {
			get {
				if (Hint != null) {
					return "LEFT "+Hint.Keyword+" JOIN";
				}
				return "LEFT JOIN";
			}
		}
	}
}
